Process of printing with indigo.



UNITED STATES PATENT OFFICE.

MORITZ VON GALLOIS, OF HOOHST-ON-THEMAIN, GERMANY, ASSIGNOR TO FARB'WERKE, VORM. MEISTER, .LUOIUS & BRUNING, OF HOOHST- ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed April 21, 1904. Serial No. 204,287-

To all whom it may concern.-

Be it known that I, MORITZ VON GALLoIs, chemist, a citizen of the Empire of Austria- Hungary, residing at Hochst on the Main, Germany, have invented certain new and useful Improvements in Printing Fabrics with Indigo, of which the following is a specification.

By the present invention in printing indigo by the hydrosulfite method strong caustic alkalies are substituted for the alkali salts previously used. This substitution is particularly applicable to printing with the stable hydrosulfite compounds made by combining an aldehyde or derivative or analogue thereof with hydrosulfurous acid or a salt or double salt thereof.

By the present method white fabrics and fabrics dyed with certain other colors, such as alizarine red, may be printed.

Exam les. Indigo-Blue Steam-Printing Color.

120 grams of formaldehyde compound of sodium hydrosulfite are dissolved in A 50 grams of water at 40 to centigrade, cooled, and slowly stirred into 500 grams of alkali thickener.

mto A.

180 grams of alkaline thickener, then cooled, and B stirred 1 kilo.

I claim is Alkaline Thicke ne r.

1 kilo.

35 The bleached cotton (unprepared) or cotton dyed with Turkey red is printed with this indigo blue steam-printing color, well dried, and then steamed in the Mather Platt apparatus for two or three minutes at to centigrade, then well washed, whereupon the indigo white oxidizes to indigo blue. The fabric is then acidified and soaped, if necessary.

Having now described my invention, what The improvement in the process of printing fabrics with indigo on white or Turkey red dyed unprepared cotton, which consists in simultaneously applying in the printing color a mixture of indigo and stable double com- 5 pounds of hydrosulfites with aldehydes and strong caustic alkalies.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

MORITZ VON GALLOIS.

Witnesses:

ALFRED BRISBOIS, JOSEPH FLAOH. 

